标题: 求助GWD 一道题~~ [打印本页] 作者: 水色青空 时间: 2010-2-11 15:01 标题: 求助GWD 一道题~~ GWD6-Q17: Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve metropolitan Boston.
A.Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve B.Concerns about public health have led to the construction of three separate sewer systems between 1876 and 1904 to serve C.Concerns about public health have led between 1876 and 1904 to the construction of three separate sewer systems for serving D.There were concerns about public health leading to the construction between 1876 and 1904 of three separate sewer systems serving E.There were concerns leading between 1876 and 1904 to the construction of three separate sewer systems for serving
为什么答案是A不是B？为什么不能用完成时呢？表示这个动作已经完成了啊？
谢谢大家~~作者: 水色青空 时间: 2010-2-11 15:27
顶~作者: 水色青空 时间: 2010-2-12 20:36
为什么没有人~~再顶一下~~作者: mycontrol01 时间: 2010-2-13 21:35
A.Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve B.Concerns about public health have led to the construction of three separate sewer systems between 1876 and 1904 to serve
A里 between 1876 and 1904修饰 construction B里 这个词组修饰SYSTEM，意思是似乎这个系统只在1876和1904之间有作用